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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4daba6ce4689b680efb86376eaa802ceca04294b5176a348406d42f20e4ce9b2' 
  AND token = 'n9639k6PFD2FXOPaOJT030mzYD3kybhQ5IZ5fohFVxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}